<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            border: solid;
        }
        .main{
            position: fixed;
            top: 0;
            bottom: 0;
            left: 0;    
            right: 0;
        }
        .main .left {
            width: 100px;
            position: absolute;
            top: 0;
            bottom: 0;
            left: 0;
        }
        .main .right {
            width: 100px;
            position: absolute;
            top: 0;
            bottom: 0;
            right: 0;
        }
        .main .center {
            position: absolute;
            left: 100px;
            right: 100px;
            top: 0;
            bottom: 0;
        }
        .main .center .top {
            height: 100px;
            position: absolute;
            left: 0;
            right: 0;
            top: 0;    
        }
        .main .center .bottom {
            height: 100px;
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
        }
        .main .center .middle {
            position: absolute;
            left: 0;
            right: 0;
            top: 100px;
            bottom: 100px;
        } 
    </style>
</head>
<body>
    <div class="main">
        <div class="left">left</div>
        <div class="center">
            <div class="top">top</div>
            <div class="middle">middle</div>
            <div class="bottom">bottom</div>
        </div>
        <div class="right">right</div>
    </div>
</body>
</html>